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High-Resolution Tunneling Spectroscopy of Fractional Quantum Hall States

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arXiv:2308.05789v2 Announce Type: replace
Abstract: Strong interaction among electrons in two-dimensional systems in the presence of high magnetic fields gives rise to fractional quantum Hall (FQH) states that host quasi-particles with fractional charge and statistics. We perform high-resolution scanning tunneling microscopy and spectroscopy of FQH states in ultra-clean Bernal-stacked bilayer graphene (BLG) devices. Spectroscopy of FQH states shows sharp excitations in tunneling experiments that have been predicted for electron fractionalizing into bound states of quasi-particles. From our measurements and their comparison to theoretical calculations, we find energy gaps for candidate non-abelian FQH states that are larger by a factor of 5 than other related systems, making BLG an ideal setting for the manipulation of these novel quasi-particles and for the creation of a topological quantum bit. Our STM experiment also reveals previously undiscovered states in such ultra-clean samples.

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